[Infra] Bump swift-tools-version in Package.swift

[ncooke3]

Draft– I want to see what CI fixes are needed.

Should we use 6.1? This would enforce Xcode 16.2+ Agreed, see below comment

Fix #14638

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[paulb777]

Unless we need it for some reason, keeping support for Xcode 16.2 and Swift 6.0 sounds ok to me.

[ncooke3]

This is unrelated to the Swift tools version bump. This API was added to the PackageDescription module in Swift 5.6, and seems slightly cleaner (e.g. importing ProcessInfo is unneeded).